11 pythons found tangled up in 500 pounds of 'mating balls' in southwest Florida

Wildlife conservators found 500 pounds of pythons in a single day last month in Collier County, Florida.

The 11 Burmese pythons were found Feb. 21 in three different breeding aggregations, or "mating balls," that contained one female snake and multiple male snakes, according to the Conservancy of Southwest Florida.

It was a record daily capture for the conservancy, which has been researching and removing snakes from the environment for over 10 years.

Burmese pythons, normally native to Southeast Asia, are an invasive species in the U.S., and they prey on over 72 species of animals in Florida, conservancy wildlife biologist Ian Bartoszek said. They are one of the largest species of snake in the world.

The conservancy uses male snakes that it tags with radio transmitters to lead it to female snakes during the breeding season, Bartoszek said. Once the conservancy captures the snakes in an effort to suppress the local python population, they are euthanized, and tissue samples are collected to advance genetic studies.

"It often feels like a 'CSI' wildlife crime scene in our lab during necropsies, and we frequently see firsthand how they are getting so large," Bartoszek said. "We see the remains of white-tailed deer inside of pythons often. This should sound an alarm."

The species was brought to Florida in the 1970s through the pet trade and has since become an "established apex predator across the Greater Everglades ecosystem," the conservancy's website says.

"Burmese pythons are thought to be responsible for a 90% decline in native mammal populations across their established range," the conservancy says.

The conservancy has removed more than 1,300 pythons weighing over 35,000 pounds from an area of about 150 square miles in southwestern Florida, Bartoszek said.

This article was originally published on NBCNews.com